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Li C, Franklin JL, Graves-Deal R, Jerome WG, Cao Z, Coffey RJ.Li C, et al.Proc Natl Acad Sci U S A. 2004 Apr 13;101(15):5571-6. doi: 10.1073/pnas.0401294101. Epub 2004 Apr 2.Proc Natl Acad Sci U S A. 2004.PMID: 15064403Free PMC article.